Finding the Third Proportional to 99,723 and 215,103

Step by Step Solution

1. Step 1: Write the proportion equation
   99,723 : 215,103 = 215,103 : x
2. Step 2: Convert to fraction form
   99,723/215,103 = 215,103/x
3. Step 3: Cross multiply
   99,723x = 215,103 × 215,103
4. Step 4: Simplify right side
   99,723x = 46,269,300,609
5. Step 5: Solve for x
   x = 46,269,300,609/99,723
6. Step 6: Final answer
   x = 463,978.23